CN101334172B - Middle powder storage house type pulverized coal boiler draft air intelligent control method - Google Patents
Middle powder storage house type pulverized coal boiler draft air intelligent control method Download PDFInfo
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- CN101334172B CN101334172B CN2008101368053A CN200810136805A CN101334172B CN 101334172 B CN101334172 B CN 101334172B CN 2008101368053 A CN2008101368053 A CN 2008101368053A CN 200810136805 A CN200810136805 A CN 200810136805A CN 101334172 B CN101334172 B CN 101334172B
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Abstract
The invention provides an intelligent controlling method of the induced air for a ball and filler bin type pulverized coal boiler, which relates to an controlling method of the induced air for the ball and filler bin type pulverized coal boiler, and belongs to the boiler field. The method solves the problems that the common adoption of a single loop PID control strategy for controlling the induced air in the prior ball and filler bin type pulverized coal boiler results that the running can not be performed stably and the operation can not be carried out, and the regulation can only be performed manually. The controlling method of the invention is used for judging whether the system is one of the following circumstances: whether the coal pulverizing system is under a process of enable/disable; whether an external disturbance happens to a combustion system; whether an internal disturbance happens to the combustion system; whether the supply for coal feeder is interrupted; whether the pressure of the hearth is higher than the upper range value of the running; whether the pressure of the hearth is lower than the lower range value of the running; if the results are affirmative, the PID controller is adopted by the induced air to perform a fast speed adjustment, and if the results are negative, the Fuzzy controller is adopted by the induced air to perform a steady-state adjustment.
Description
Technical field
The present invention relates to a kind of control method of middle powder-storage bin formula pulverized-coal fired boiler air inducing, belong to field of boilers.
Background technology
Burner hearth internal pressure when middle powder-storage bin formula pulverized-coal fired boiler moves directly has influence on the security and the economy of boiler operatiopn.If the burner hearth internal pressure is greater than burner hearth outside atmospheric pressure (＞0), then the fire combustion can spray outside the stove, jeopardizes personal safety, also can smolder contaminated environment; Otherwise if furnace pressure is low excessively, then fiery combustion center is drawn onto upper furnace in the burner hearth, and unstable combustion is just abnormally dangerous when less than-150Pa, is easy to the blowing out of putting out a fire.Furnace pressure is crossed the low flue gas flow that also can cause and is increased, and flue gas loss increases, and the efficiency of combustion of boiler descends.Therefore, must control the furnace pressure all-the-time stable by every means in desirable scope, be controlled at usually-15Pa～-50Pa (comparing) with extraneous normal atmospheric pressure.
Induced draught system is implemented automatically, and control is the unique effective means that addresses the above problem.But, there is multiple random perturbation problem in this boiler when operation, as the tertiary air disturbance in the pulverized coal preparation system shutdown process, the fuel flow disturbance in the boiler combustion process, also have factors such as the non-linear and burner hearth of ventilation door leaks out, make that air inducing is difficult to put into operation automatically, particularly be widely used in the conventional DCS configuration control method of big unit at present, after such boiler applications, air inducing is regulated and is not caught up with, and is not " slow excessively ", is exactly " too fast ".If regulate " slow excessively ", then when furnace pressure changed, the ventilation door responsiveness was too slow, and furnace pressure can not be effectively controlled, and exceeds allowed band, caused putting out a fire outside the flame ejection stove or because of negative pressure is too high; If regulate " too fast ", then furnace pressure overshoot, the air and flue system concussion, the fire combustion in the burner hearth changes violent up and down, very easily fire extinguishing.In addition, regulate " too fast " and also can cause serious harm to ventilation door, reduce the service life of air door, what have must keep in repair or change less than one month.Just because of the problems referred to above, the air inducing of the type boiler fails to put into operation automatically always, and the security of boiler operatiopn and economy can't guarantee.Therefore, press for the research and development new technology, solve the automatic control problem of such boiler induced draught system.Single loop PID control strategy is generally adopted in the control of the air inducing of powder-storage bin formula pulverized-coal fired boiler at present, because of can not stable operation putting into operation, can only lean on manually and regulate.
Summary of the invention
Single loop PID control strategy is generally adopted in the air inducing control of powder-storage bin formula pulverized-coal fired boiler in the objective of the invention is to overcome at present, because of can not stable operation putting into operation, can only lean on the problem of regulating manually, a kind of middle powder-storage bin formula pulverized-coal fired boiler air inducing intelligence control method is provided.
Control method of the present invention may further comprise the steps:
Step a: judge whether pulverized coal preparation system is in and open/stop in the process,
Judged result is for being, execution in step b, and judged result is not for, execution in step c;
Step b: introduce the feedforward compensation of mill exhauster outlet pressure signal as ventilation door aperture control output; Transient state control time Tzt=4 * Ti, wherein Ti is the integration time constant of PID controller, unit is second; Execution in step m then;
Step c: judge whether combustion system external disturbance takes place,
Judged result is for being, execution in step d, and judged result is not for, execution in step e;
Steps d: introduce the feedforward compensation of air output signal as ventilation door aperture control output; Transient state control time Tzt=8 * Ti; Execution in step m then;
Step e: judge whether combustion system internal disturbance takes place,
Judged result is for being, execution in step f, and judged result is not for, execution in step g;
Step f: introduce the feedforward compensation of air output signal as ventilation door aperture control output; Transient state control time Tzt=8 * Ti; Execution in step m then;
Step g: judge whether cut-off of feeder,
Judged result is for being, execution in step h, and judged result is not for, execution in step i;
Step h: transient state control time Tzt=8 * Ti; Execution in step m then;
Step I: whether judge furnace pressure greater than the operation higher limit,
Judged result is for being, execution in step j, and judged result is not for, execution in step k;
Step j: transient state control time Tzt=4 * Ti; Execution in step m;
Step k: whether judge furnace pressure less than the operation lower limit,
Judged result is for being, execution in step l, and judged result is not for, then execution in step m;
Step l: transient state control time Tzt=4 * Ti; Execution in step m then;
Step m: the transient state control time Tzt=0 that judges whether to satisfy condition,
Judged result is for being, execution in step n, and judged result is not for, execution in step o;
Step n: air inducing adopts Fuzzy controller steady-state adjustment, and the Fuzzy controller is a fuzzy controller;
Step o: transient state control time Tzt=Tzt-1; Air inducing adopts PID controller quick adjustment.
Advantage of the present invention is: the full and accurate all problems that runs in such boiler operatiopn of having contained of present technique, and at these problems, provide decision logic and control scheme respectively, overcome the automatic various disturbing factors of air inducing effectively, realized the automatic operation of induced draught system long-term stability.Because the control technology that has adopted transient state and stable state to separate had both guaranteed crisis quick response constantly, had realized the steady adjusting under the stable case again, reduced the air door operating frequency, had prolonged the service life of air door.
Description of drawings
Fig. 1 is the flow chart of the inventive method.
The specific embodiment
The specific embodiment one: below in conjunction with Fig. 1 present embodiment is described, the control method of present embodiment may further comprise the steps:
Step a: judge whether pulverized coal preparation system is in and open/stop in the process,
Judged result is for being, execution in step b, and judged result is not for, execution in step c;
Step b: introduce the feedforward compensation of mill exhauster outlet pressure signal as ventilation door aperture control output; Transient state control time Tzt=4 * Ti, wherein Ti is the integration time constant of PID controller, unit is second; Execution in step m then;
Step c: judge whether combustion system external disturbance takes place,
Judged result is for being, execution in step d, and judged result is not for, execution in step e;
Steps d: introduce the feedforward compensation of air output signal as ventilation door aperture control output; Transient state control time Tzt=8 * Ti; Execution in step m then;
Step e: judge whether combustion system internal disturbance takes place,
Judged result is for being, execution in step f, and judged result is not for, execution in step g;
Step f: introduce the feedforward compensation of air output signal as ventilation door aperture control output; Transient state control time Tzt=8 * Ti; Execution in step m then;
Step g: judge whether cut-off of feeder,
Judged result is for being, execution in step h, and judged result is not for, execution in step i;
Step h: transient state control time Tzt=8 * Ti; Execution in step m then;
Step I: whether judge furnace pressure greater than the operation higher limit,
Judged result is for being, execution in step j, and judged result is not for, execution in step k;
Step j: transient state control time Tzt=4 * Ti; Execution in step m then;
Step k: whether judge furnace pressure less than the operation lower limit,
Judged result is for being, execution in step l, and judged result is not for, execution in step m;
Step l: transient state control time Tzt=4 * Ti; Execution in step m then;
Step m: the transient state control time Tzt=0 that judges whether to satisfy condition,
Judged result is for being, execution in step n, and judged result is not for, execution in step o;
Step n: air inducing adopts Fuzzy controller steady-state adjustment, and the Fuzzy controller is a fuzzy controller;
Step o: transient state control time Tzt=Tzt-1; Air inducing adopts PID controller quick adjustment,
Each sampling period of transient state control time Tzt is from subtracting 1, until being 0.
The specific embodiment two: the difference of present embodiment and embodiment one is, the fuzzy control according to the form below is looked into the numerical value of fuzzy factor fz among the step n, calculate the output quantity du=fz * step of control ventilation door aperture, wherein Step is a fuzzy control step size increments coefficient, step=-1:
Wherein:
E is the deviation of furnace pressure, for this furnace pressure and last time furnace pressure difference,
E ' is the derivative of furnace pressure deviation, e '=de/dt,
Fz is the fuzzy factor, and other is identical with embodiment one.
Claims (2)
1. middle powder-storage bin formula pulverized-coal fired boiler air inducing intelligence control method is characterized in that may further comprise the steps:
Step a: judge whether pulverized coal preparation system is in and open/stop in the process,
Judged result is for being, execution in step b, and judged result is not for, execution in step c;
Step b: introduce the feedforward compensation of mill exhauster outlet pressure signal as ventilation door aperture control output; Transient state control time Tzt=4 * Ti, wherein Ti is the integration time constant of PID controller, unit is second; Execution in step m then;
Step c: judge whether combustion system external disturbance takes place,
Judged result is for being, execution in step d, and judged result is not for, execution in step e;
Steps d: introduce the feedforward compensation of air output signal as ventilation door aperture control output; Transient state control time Tzt=8 * Ti; Execution in step m then;
Step e: judge whether combustion system internal disturbance takes place,
Judged result is for being, execution in step f, and judged result is not for, execution in step g;
Step f: introduce the feedforward compensation of air output signal as ventilation door aperture control output; Transient state control time Tzt=8 * Ti; Execution in step m then;
Step g: judge whether cut-off of feeder,
Judged result is for being, execution in step h, and judged result is not for, execution in step i;
Step h: transient state control time Tzt=8 * Ti; Execution in step m then;
Step I: whether judge furnace pressure greater than the operation higher limit,
Judged result is for being, execution in step j, and judged result is not for, execution in step k;
Step j: transient state control time Tzt=4 * Ti; Execution in step m then;
Step k: whether judge furnace pressure less than the operation lower limit,
Judged result is for being, execution in step l, and judged result is not for, execution in step m;
Step l: transient state control time Tzt=4 * Ti; Execution in step m then;
Step m: the transient state control time Tzt=0 that judges whether to satisfy condition,
Judged result is for being, execution in step n, and judged result is not for, execution in step o;
Step n: air inducing adopts Fuzzy controller steady-state adjustment, and the Fuzzy controller is a fuzzy controller;
Step o: transient state control time Tzt=Tzt-1; Air inducing adopts PID controller quick adjustment.
2. powder-storage bin formula pulverized-coal fired boiler air inducing intelligence control method in according to claim 1, it is characterized in that the fuzzy control according to the form below is looked into the numerical value that blurs factor fz among the step n, calculate the output quantity du=fz * step of control ventilation door aperture, wherein Step is a fuzzy control step size increments coefficient, step=-1:
Wherein:
E is the deviation of furnace pressure, for this furnace pressure and last time furnace pressure difference,
E ' is the derivative of furnace pressure deviation, e '=de/dt,
Fz is the fuzzy factor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2008101368053A CN101334172B (en) | 2008-07-28 | 2008-07-28 | Middle powder storage house type pulverized coal boiler draft air intelligent control method |
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| CN2008101368053A CN101334172B (en) | 2008-07-28 | 2008-07-28 | Middle powder storage house type pulverized coal boiler draft air intelligent control method |
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| CN101334172B true CN101334172B (en) | 2010-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943396A (en) * | 2010-09-29 | 2011-01-12 | 神华集团有限责任公司 | Combustion control method and combustion control system of pulverized-fuel boiler |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286984B (en) * | 2013-05-29 | 2015-02-25 | 中国工程物理研究院化工材料研究所 | Method for controlling depressurization of warm isostatic press |
| CN103412479B (en) * | 2013-08-21 | 2016-01-20 | 哈尔滨工业大学中远工控有限公司 | Paired running oxygen-eliminating device intelligent control method |
| CN109639111A (en) * | 2018-12-20 | 2019-04-16 | 深圳市英威腾电气股份有限公司 | A kind of control method of frequency converter, system, equipment and storage medium |
| CN113464920B (en) * | 2021-07-07 | 2023-05-30 | 哈尔滨中远控制工程有限公司 | Method and system for coordinated control of main pipe steam pressure |
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| CN1127863A (en) * | 1995-09-04 | 1996-07-31 | 上海海通锅炉微机控制有限公司 | Microcomputer controlled device and method for boiler |
| US5971747A (en) * | 1996-06-21 | 1999-10-26 | Lemelson; Jerome H. | Automatically optimized combustion control |
| US6227842B1 (en) * | 1998-12-30 | 2001-05-08 | Jerome H. Lemelson | Automatically optimized combustion control |
| CN101078525A (en) * | 2007-06-25 | 2007-11-28 | 周振华 | Automatic optimization control method of boiler air-supply volume |
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2008
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127863A (en) * | 1995-09-04 | 1996-07-31 | 上海海通锅炉微机控制有限公司 | Microcomputer controlled device and method for boiler |
| US5971747A (en) * | 1996-06-21 | 1999-10-26 | Lemelson; Jerome H. | Automatically optimized combustion control |
| US6227842B1 (en) * | 1998-12-30 | 2001-05-08 | Jerome H. Lemelson | Automatically optimized combustion control |
| CN101078525A (en) * | 2007-06-25 | 2007-11-28 | 周振华 | Automatic optimization control method of boiler air-supply volume |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943396A (en) * | 2010-09-29 | 2011-01-12 | 神华集团有限责任公司 | Combustion control method and combustion control system of pulverized-fuel boiler |
| CN101943396B (en) * | 2010-09-29 | 2012-05-23 | 神华集团有限责任公司 | Combustion control method and combustion control system of pulverized-fuel boiler |
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Granted publication date: 20100616 Termination date: 20160728 |